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PDF ATA2745 Data sheet ( Hoja de datos )
| Número de pieza | ATA2745 | |
| Descripción | UHF ASK Transmitter | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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Features
• Very High Transmitting Frequency Accuracy Compared to SAW Solutions
(Enables Receivers at Lower Bandwidth than With SAW Resonators)
• Lower Cost than the Usual Discrete Solutions Using SAW and Transistors
• Supply Voltage 2.2V to 4.0V in the Temperature Range of –40°C to 85°C
• XTO Output for Clocking the Microcontroller, Thereby, Together with the ATAR090 or
ATAR890, Resulting in the Optimum System Cost-effectiveness
• One-chip Solution With Minimum External Circuitry
• Single-ended Open-collector Output (Same Antennas Can Be Used as in Discrete
Solutions, Simpler Matching of Magnetic Loop Antennas)
• ESD Protection According to MIL-STD 883 (4 KV HBM) Except Pins XTO1, XTO2, ANT
and LF
• Very Small SSO16 Package, Pitch 0.635, 150 mil
1. Description
The ATA2745 is a PLL transmitter IC which has been developed especially for the
demands of RF low-cost data transmission systems at data rates up to 20 kBaud.
The transmitting frequency range is 310 MHz to 440 MHz. It can be used in ASK sys-
tems. The main applications of the ATA2745 are in the areas of outside temperature
metering, socket control, garage door openers, consumption metering, light/fan or air-
conditioning controls, jalousies, wireless keyboards, and various other consumer
market applications.
UHF ASK
Transmitter
ATA2745
www.DataSheet4U.com
4898B–RKE–08/06
1 page  
ATA2745
5.1 Output Power Measurement
The following output network (Figure 5-1 on page 5) can be used for output power evaluation,
the exact values of L10 and C10 are dependent on the layout.
L10 and C10 form the transformation network to adopt the output impedance of the IC to 50Ω. The
following table shows the values for an output power of 2 mW and an RPWRSET = 1.2 kΩ.
Table 5-1. Transformation Network
f [MHz]
315
433.92
C10 [pF]
2.7
1.8
Figure 5-1. Measurement Output Network
PWRVCC
ANT
L10 [nH]
56
33
VS
L10
ZLoad-opt
C10
50Ω
ZLoad-opt [Ω]
260 + j330
185 + j268
Figure 5-2. Application Circuit
+VS = 2.2 ... 4.0 V
ASK
EN
CLK
C6
3.39 MHz
C5
R4
ASK
1
EN
2
VCC
3
CLK
4
GND
5
LFVCC
6
LFGND
7
C1 LF
8
OR
Power
up
VCO
f
64
f
n
ATA2745
PA
XTO
C2
GND
16
PWRSET
15
PWRVCC
14
RPWRSET
ANT
13
C4
PWRGND1
12
CLoop2
LFeed
CLoop1
PWRGND2
11
XTO1
13.56 MHz
10
NC
9
C3
Antenna
4898B–RKE–08/06
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet ATA2745.PDF ] | |
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